SYSTEM CALLS FOR I/0

The idea of this exercise is to communicate between a child and a parent using a shared file that the user will specify.

Your program will require the name of the file to be sent as a command line argument (argv[1])

A skeleton algorithm is provided below:

1. Check that the number of command line arguments is 2. If it isn't, produce an error message. Note: you cannot use perror here.
2. Use "fork" to produce a child and parent
   • Child will:
     • open the file for writing (make sure to use the "create" flag and permissions for the user to read and write)
     • check for errors on opening and use perror to describe the error.
     • read from standard input (until end of file,ie., you type CTRL-D)
     • write to the file
     • when done, close the file
   • Parent will:
     • "wait" for the child
     • open the file for reading
     • check for errors on opening and use perror to describe the error.
     • write a message that you are in the parent
     • read from the file (until end of file)
     • write to standard output
     • when done, close the file
4. Don't forget to handle the error situation